4 port USB charging station， Compatible with iPhone， iPad， HTC phones， Samsung Galaxy Tab， Samsung Galaxy Phone， Samsung Galaxy Note， Blackberry， MP3 players， Digital Camera， & other USB devices  It's an ideal solution for you or your family /friends and colleagues to charging or powering devices easily   Use your existing USB charging cables to charge most USB powered devices   Highest Power rating at 30W / 6 Amps output， at least twice the power of any other four port charger   Compact Design and Flip Down AC Prongs make it easy to carry on travel   Sophisticated circuit design with over-heated， over-current， over-charging protection. Charging will be automatically stop when battery is full   With OTG port allows Smartphone to act as a host for other USB devices like a USB flash drive， digital camera， mouse or keyboard https://www.youtube.com/watch?v=Xr-G6COWLYY